glCopyTexImage2D - OpenGL ES 3.0 Reference Pages

Name

glCopyTexImage2D — copy pixels into a 2D texture image

C Specification

`void glCopyTexImage2D(`	GLenum `target`,
	GLint `level`,
	GLenum `internalformat`,
	GLint `x`,
	GLint `y`,
	GLsizei `width`,
	GLsizei `height`,
	GLint `border)`;

Parameters

target: Specifies the target texture. Must be GL_TEXTURE_2D, GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, or GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.
level: Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image.
internalformat: Specifies the internal format of the texture. Must be one of the following symbolic constants: GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_RGB, GL_RGBA, GL_R8, GL_RG8, GL_RGB565, GL_RGB8, GL_RGBA4, GL_RGB5_A1, GL_RGBA8, GL_RGB10_A2, GL_SRGB8, GL_SRGB8_ALPHA8, GL_R8I, GL_R8UI, GL_R16I, GL_R16UI, GL_R32I, GL_R32UI, GL_RG8I, GL_RG8UI, GL_RG16I, GL_RG16UI, GL_RG32I, GL_RG32UI, GL_RGBA8I, GL_RGBA8UI, GL_RGB10_A2UI, GL_RGBA16I, GL_RGBA16UI, GL_RGBA32I, GL_RGBA32UI.
x, y: Specify the window coordinates of the lower left corner of the rectangular region of pixels to be copied.
width: Specifies the width of the texture image.
height: Specifies the height of the texture image.
border: Specifies the width of the border. Must be 0.

Description

glCopyTexImage2D defines a two-dimensional texture image, or cube-map texture image with pixels from the current GL_READ_BUFFER.

The screen-aligned pixel rectangle with lower left corner at (x, y) and with a width of width and a height of height defines the texture array at the mipmap level specified by level. internalformat specifies the internal format of the texture array.

The pixels in the rectangle are processed exactly as if glReadPixels had been called, but the process stops after conversion to RGBA values. The error INVALID_OPERATION is generated if integer RGBA data is required and the format of the current color buffer is not integer; or if floating- or fixed-point RGBA data is required and the format of the current color buffer is integer.

Pixel ordering is such that lower x and y screen coordinates correspond to lower s and t texture coordinates.

If any of the pixels within the specified rectangle of the current GL_READ_BUFFER are outside the window associated with the current rendering context, then the values obtained for those pixels are undefined.

When internalformat is one of the sRGB types, the GL does not automatically convert the source pixels to the sRGB color space.

Notes

An image with height or width of 0 indicates a NULL texture.

Errors

GL_INVALID_ENUM is generated if target is not GL_TEXTURE_2D, GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, or GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.

GL_INVALID_VALUE is generated if level is less than 0.

GL_INVALID_VALUE may be generated if level is greater than log 2 ⁢ max , where max is the returned value of GL_MAX_TEXTURE_SIZE.

GL_INVALID_VALUE is generated if width or height is less than 0 or greater than GL_MAX_TEXTURE_SIZE.

GL_INVALID_VALUE is generated if border is not 0.

GL_INVALID_VALUE is generated if internalformat is not an accepted format.

GL_INVALID_OPERATION is generated if internalformat is GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24, or GL_DEPTH_COMPONENT32F and there is no depth buffer.